Acetylene lamp bowl



Oct. 1, 1940. c. s. PACKER 2,216,280

' AGE'I'YLENE LAMP BOWL Filed Sept. 22, 1938 Patented Oct. 1, 1940 UNITED STATES PATENT OFFICE AOETYLENE LAlWP BOWL Charles S.v Packer, Chicago, 111., assignor to Justrite Manufacturing Company, Chicago, 111., acorporation of Illinois Application September 22, 1938, Serial No. 231,227

1 Claim.

The present invention relates ,to a buffer ring for acetylene lamp bowls, the object of the invention being to provide a means whereby a portion of the lamp bowl may be projected against a hard surface for the purpose of dislodging the spent calcium carbide contained therein, thus to prevent injury to the bowl per se, and wherein the said buffer is so constructed as to provide ample air-passage space between the body of the bufier ring and the lamp bowl for causing free circulation of air about the portion of the bowl encircled by said buffer for effecting cooling of said bowl and the contents thereof during operation of the lamp.

A further object of the invention is to provide a buffer for such lamp bowls which may be anchored in place along either the top or bottom end portion of the bowl.

It has been common practice for a number of years to provide a soft rubber jacket for acetylene lamp bowls which embraced either an end portion of the circumferential wall of the bowl or which covered the entire circumferential wall thereof. An objection to such buffer rings has been that the lamp bowl becomes exceedingly hot during the liberation of gas from the calcium carbide contained in the bowl when adding water to said carbide, and the result has been that contact of the fingers with the bottom or top walls of said bowl and parts of the lamp contiguous thereto, has caused burns on the fingers. The heat is also detrimental in other respects, it being preferable that the acetylene gas should be relatively cool at the point of discharge and combustion.

The present invention is designed to overcome these difiiculties and to prevent the heating of the lamp bowl and contents thereof to an appreciably higher degree than is common, without the use of buffers.

4 A suitable embodiment of the invention is illustrated in the accompanying drawing, wherein Fig. 1 is a perspective view of a lamp bowl equipped with a buffer device constructed in accordance with the invention, said buffer device being shown partly in section.

Fig. 2 is a plan view of the lamp bowl equipped with a buffer constructed in accordance with the invention.

Fig. 3 is a fragmentary vertical longitudinal sectional view taken on the line 3-3 of Fig. 1.

Fig. 4 is a plan sectional view taken on the line 4- l of Fig. 1.

Fig. 5 is a fragmentary detail sectional view of the buffer illustrating a modification in the construction thereof.

Fig. 6 is a fragmentary horizontal sectional View through the lamp bowl and a resilient ring com-- posed of a single piece ofrubber, or the like, mounted thereon. I

The lamp bowl I is usually equipped along its upper and lower edges with outwardly projecting annular beads 2 and 3, respectively, the. body of the circumferential wall of the bowl being generally cylindrical and usually equipped with beads extending longitudinally thereof for increasing the surface area of the same.

The device of my invention is adapted for any type or shape of acetylene lamp and in the accompanying drawing, it is illustrated as applied to a bowl having a smooth cylindrical circumferential wall equipped with the aforesaid beads 2 and 3.

In its preferred form of construction, the buffer device of the present invention comprises an inner ring 4 of sheet metal of an inner diameter adapted to snugly fit the circumferential wall of the bowl I between the said beads 2 and 3, said ring 4 being preferably corrugated as shown, thereby to provide rojections engaged with the peripheral wall of the bowl for spacing the body portion of the ring from the same and thus providing free air spaces or passages between the surface of the circumferential wall of the bowl and the body portion of said ring A for free circulation of air. The said ring A is preferably composed of a band of corrugated metal, as aforesaid, which is of greater length than the circumference of the surface which it is adapted to encircle, so that the same may be readily applied to the circumferential wall of the bowl at any desired point between said beads 2 and 3 by merely overlapping the ends of the ring upon each other without, however, securing the same against separation unless that should be found desirable. The corrugations lend themselves readily to effecting an interengagement of the overlapped end portions of said ring 4.

A band 5 of elastic material, such as rubber, having low heat conductivity, and which is normally of smaller diameter than the outer diameter of the ring 4, is disposed about the latter and serves to hold the same against displacement from said bowl and against separation of its overlapped end portions.

The band 5 is preferably of slightly greater width than the ring 4 and may overhang the top and bottom edges of the outermost portions of the ring 4 to hold the band 5 relatively securely in place on said ring.

The ring 4 is equipped along one edge with a plurality of ductile projections 6 to be bent to embrace one of the beads 2 or 3, as the case may be, and thus to hold the bufier device against movement longitudinally of the circumferential wall of the bowl.

In the structure of Fig. 5, the rubber or similar elastic band 1 encircling and embracing the ring 4 of corrugated sheet metal is of sufficient width to overlap and hug one of the beads 2 or 3, the lower bead 3 being shown as embraced thereby.

Due to the greater width of the band I than the band 5, and the overlapping of its lower edge portion 8 to embrace a bead, the free circulation of air from bottom to top of the air passages afforded by the ring 4 is obstructed, and for that reason, the structure of Fig. 4 is preferred.

The buffer of the present invention is obviously capable of being variously embodied to produce the desired result as herein described without departing from the spirit of the invention as defined in the appended claim.

In Fig, 6 another embodiment of the invention is illustrated as comprising a ring 9 of rubber, or other resilient material, of a non-heat-conducting character, which is equipped on its inner face with projections l engaging the circumferential wall of the bowl 0, said projections operating to space the body of the ring from the wall of the lamp bowl and thus provide air passages between the body of the ring and the lamp bowl wall encircled thereby, the length of the ring 9 axially of the lamp bowl being preferably substantially the same as that of the ring 5, though said length may be varied as desired.

I claim as my invention:

The combination with a substantially cylindrical sheet metal bowl of a portable acetylene lamp, of a resilient band of rubber or the like equipped interiorly with longitudinal ribs extending from end to end thereof, said ribs spaced apart a distance substantially equal to their width and being of a length radially substantially equal to the thickness of the body portion of said band with their inner ends abutting and closely hugging the outer surface of said bowl and cooperating with the latter to provide a series of flues about said bowl for circulation of air therethrough to absorb heat from said bowl, the radial thickness of said band from its circumferential surface to the inner extremities of said ribs being such as to enable the bowl to be manipulated to project said band forcibly against an unyielding surface without effecting distortion of said bowl.

CHARLES S. PACKER. 

